Fix Version from Tag not picked up (#705)

backend/Dockerfile

@@ -3,6 +3,7 @@ FROM python:3.11.4-slim-bookworm
 # Default DANSWER_VERSION, typically overriden during builds by GitHub Actions.
 ARG DANSWER_VERSION=0.2-dev
 ENV DANSWER_VERSION=${DANSWER_VERSION}
+RUN echo "DANSWER_VERSION: ${DANSWER_VERSION}"
 
 # Install system dependencies
 RUN apt-get update && \